Details & Changes.

The ventilation window until ch.number 20-041711. Note the difference in the handle for the sliding
window catch. The red circle. This type were on all barndoors.

Except from small changes the ventilation window look like this from ch.number 20-041712 until end of split screen window buses in 1967.

Handle for ventilation window on front door until ch.number 20-041711 (left)
Handle for ventilation window on front door from ch.number 20-041712.